Their water content (a relevant parameter than can critically affect the properties and behaviour of ionic liquids [26]), as measured by the Karl Fischer titration method in a Metrohm 737 KF coulometer, was found to be 2 ⋅ 10−4 and 9 ⋅ 10−4 in mass fraction for [C2mim][EtSO4] and [C2mim][OAc] respectively.